Contacts of the helix formed by residues 323 - 348 (chain D) in PDB entry 1U3Q


Residue contacts within the protein are derived with the CSU software (Sobolev V., Sorokine A., Prilusky J., Abola E.E. and Edelman M. (1999) Automated analysis of interatomic contacts in proteins. Bioinformatics, 15, 327-332). A short description of the analytical approach is given at the end of the page.
For CSU analysis of other PDB entry

Note:
Non-standard 3 letter residue codes indicate a heterogroup. To identify and analyse, use LPC software

Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB   - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC   - hydrophobic-hydrophilic contact (destabilizing contact)
+/-  - indicates presence/absence of a specific contacts
*    - indicates residues forming contacts  by their side chain
       (including CA atoms)
Residues in contact with SER 323 (chain D).
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    321D  GLU      4.0     0.4    +      -       -      -
    322D  LEU*     1.3    75.6    -      -       -      +
    324D  LEU*     1.3    65.0    +      -       -      +
    325D  PHE*     3.4     9.7    +      -       -      +
    326D  ASP*     2.9    40.0    +      -       -      +
    327D  GLN*     3.0    10.4    +      -       -      +
    422D  SER*     3.3    15.8    +      -       -      -
----------------------------------------------------------
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Residues in contact with LEU 324 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    320D  VAL      5.6     0.9    -      -       -      +
    322D  LEU      5.0     0.9    -      -       -      +
    323D  SER*     1.3    72.5    -      -       -      +
    325D  PHE*     1.3    69.5    +      -       +      +
    327D  GLN*     3.4    24.3    +      -       -      +
    328D  VAL*     3.0    35.4    +      -       +      +
----------------------------------------------------------
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Residues in contact with PHE 325 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    323D  SER*     3.1     7.9    +      -       -      +
    324D  LEU*     1.3    85.6    -      -       +      +
    326D  ASP*     1.3    61.1    +      -       -      +
    328D  VAL*     4.1     5.5    -      -       +      +
    329D  ARG*     2.9    31.7    +      -       -      +
----------------------------------------------------------
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Residues in contact with ASP 326 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    322D  LEU*     4.2    13.7    -      -       +      -
    323D  SER*     2.9    22.1    +      -       -      +
    325D  PHE*     1.3    77.0    -      -       -      +
    327D  GLN*     1.3    57.3    +      -       -      +
    329D  ARG*     3.0    30.5    +      -       -      +
    330D  LEU*     2.8    43.3    +      -       +      +
    409D  SER*     5.0     1.4    +      -       -      -
    411D  TYR      4.5     6.5    -      -       -      +
    422D  SER*     2.7    33.0    +      -       -      -
    423D  SER*     5.4     1.5    +      -       -      -
    426D  LEU*     6.0     4.7    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLN 327 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    314D  LYS*     4.9     8.0    -      -       -      +
    319D  PHE*     3.3    58.2    +      -       +      +
    320D  VAL*     3.3    19.4    +      -       -      +
    322D  LEU*     2.8    28.9    +      -       +      -
    323D  SER      3.0     9.6    +      -       -      +
    324D  LEU*     3.4    29.6    +      -       -      +
    326D  ASP*     1.3    77.2    -      -       -      +
    328D  VAL*     1.3    63.1    +      -       +      +
    330D  LEU*     3.7     1.4    +      -       -      +
    331D  LEU*     3.2    31.5    +      -       +      +
----------------------------------------------------------
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Residues in contact with VAL 328 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    324D  LEU*     3.0    22.1    +      -       +      +
    325D  PHE*     4.2     5.8    -      -       +      +
    327D  GLN*     1.3    76.7    -      -       +      +
    329D  ARG*     1.3    60.1    +      -       -      +
    331D  LEU*     3.8     6.2    -      -       +      +
    332D  GLU*     2.8    65.9    +      -       +      +
----------------------------------------------------------
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Residues in contact with ARG 329 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    325D  PHE      2.9    20.2    +      -       -      +
    326D  ASP*     3.0    26.6    +      -       -      +
    328D  VAL*     1.3    75.2    -      -       -      +
    330D  LEU*     1.3    65.1    +      -       +      +
    332D  GLU*     4.1     8.4    -      -       -      +
    333D  SER*     3.1    29.2    +      -       -      -
    409D  SER*     3.8    20.9    +      -       -      +
    410D  MET      5.5     0.2    -      -       -      +
    411D  TYR      2.6    30.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 330 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    319D  PHE*     4.0    13.0    -      -       +      -
    322D  LEU*     3.6    31.2    -      -       +      -
    326D  ASP*     2.8    26.6    +      -       +      +
    327D  GLN      3.9     3.6    -      -       -      +
    329D  ARG*     1.3    75.2    -      -       -      +
    331D  LEU*     1.3    63.2    +      -       -      +
    333D  SER*     3.3     0.6    +      -       -      -
    334D  CYS*     3.3    19.6    +      -       -      -
    405D  LEU*     3.6    28.9    -      -       +      +
    406D  LEU*     4.4    13.5    -      -       +      +
    408D  SER*     3.4    14.2    +      -       -      +
    409D  SER*     3.5    33.7    -      -       -      +
    426D  LEU*     3.9    14.4    -      -       +      -
----------------------------------------------------------
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Residues in contact with LEU 331 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309D  MET*     4.1    28.5    -      -       +      +
    310D  ILE*     4.4    26.2    -      -       +      -
    312D  TRP*     5.3     0.4    -      -       +      -
    313D  ALA*     3.9    22.9    -      -       +      -
    319D  PHE*     4.0    17.3    -      -       +      -
    327D  GLN*     3.2    22.2    +      -       +      +
    328D  VAL*     3.9     6.5    -      -       +      +
    330D  LEU*     1.3    79.1    -      -       -      +
    332D  GLU*     1.3    63.4    +      -       +      +
    333D  SER      3.1     0.3    +      -       -      -
    334D  CYS*     4.6     0.7    -      -       -      -
    335D  TRP*     3.0    29.8    +      -       -      +
    405D  LEU*     3.9    14.1    -      -       +      -
    494D  MET*     4.0    13.5    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 332 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    328D  VAL*     2.8    50.9    +      -       +      +
    329D  ARG*     4.3     7.8    -      -       -      +
    331D  LEU*     1.3    71.6    -      -       +      +
    333D  SER*     1.3    57.1    +      -       -      +
    334D  CYS      3.6     0.2    -      -       -      -
    335D  TRP*     3.2    19.9    +      -       -      -
    473D  MET*     5.2     2.3    -      -       -      +
    493D  GLU*     4.6     9.9    -      -       -      +
    494D  MET*     3.9    28.4    -      -       +      +
    497D  ALA*     3.3    33.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with SER 333 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    329D  ARG*     3.1    21.2    +      -       -      -
    330D  LEU      3.8     2.9    -      -       -      -
    331D  LEU      3.1     1.2    -      -       -      -
    332D  GLU*     1.3    80.0    -      -       -      +
    334D  CYS*     1.3    56.7    +      -       -      +
    335D  TRP*     4.8     1.3    -      -       -      -
    337D  GLU*     4.8     4.3    -      -       -      +
    408D  SER*     3.3    29.4    +      -       -      -
    409D  SER*     6.3     0.4    -      -       -      -
    466D  ARG*     5.4     6.1    +      -       -      -
    473D  MET*     5.7     4.3    -      -       -      +
----------------------------------------------------------
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Residues in contact with CYS 334 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    330D  LEU      3.3    17.5    +      -       -      -
    331D  LEU*     4.3     3.4    -      -       -      -
    333D  SER*     1.3    78.1    -      -       -      +
    335D  TRP*     1.3    66.9    +      -       -      +
    336D  MET      3.4     3.1    -      -       -      -
    337D  GLU*     3.2    27.8    +      -       -      +
    338D  VAL*     3.0    35.6    +      -       -      +
    404D  ILE*     4.0     3.6    -      -       +      +
    405D  LEU*     3.7    28.7    -      -       -      -
    408D  SER*     3.7    16.4    -      -       -      -
----------------------------------------------------------
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Residues in contact with TRP 335 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302D  ALA*     5.0     1.3    -      -       +      -
    306D  LEU*     3.9    22.0    -      -       +      -
    309D  MET*     3.2    24.8    -      -       +      +
    331D  LEU      3.0    14.1    +      -       -      +
    332D  GLU*     3.2    27.6    +      -       -      -
    333D  SER      4.8     1.1    -      -       -      -
    334D  CYS*     1.3    76.3    -      -       -      +
    336D  MET*     1.3    99.8    +      -       +      +
    338D  VAL      3.1     2.8    +      -       -      -
    339D  LEU*     2.9    37.3    +      -       +      +
    473D  MET*     3.2    40.0    -      -       +      +
    476D  LEU*     4.3     2.0    -      -       +      -
    491D  LEU*     3.6    30.1    -      -       +      -
    494D  MET*     3.6    41.7    +      -       +      +
    495D  LEU*     4.1    14.8    -      -       +      -
----------------------------------------------------------
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Residues in contact with MET 336 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302D  ALA*     6.3     0.7    -      -       +      -
    334D  CYS      3.4     0.8    -      -       -      -
    335D  TRP*     1.3   105.9    -      -       +      +
    337D  GLU*     1.3    55.3    +      -       -      +
    339D  LEU*     3.0    20.1    +      -       +      +
    340D  MET*     2.8    42.8    +      -       -      +
    469D  SER*     3.0    36.1    -      -       -      +
    472D  GLY*     4.0    22.9    -      -       -      +
    473D  MET*     3.9    18.4    -      -       +      +
    476D  LEU*     4.9     4.7    -      -       +      -
    501D  272      3.9    36.6    -      -       +      -
----------------------------------------------------------
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Residues in contact with GLU 337 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    333D  SER      4.8     2.0    -      -       -      +
    334D  CYS*     3.2    23.0    +      -       -      +
    336D  MET*     1.3    76.4    -      -       -      +
    338D  VAL*     1.3    58.6    +      -       -      +
    340D  MET*     3.3     1.6    +      -       -      +
    341D  MET*     2.9    31.1    +      -       -      +
    404D  ILE*     3.2    28.8    -      -       +      +
    408D  SER*     5.1     0.3    -      -       -      -
    462D  LEU      4.6     1.7    -      -       -      +
    465D  VAL*     3.8    16.4    -      -       +      +
    466D  ARG*     2.3    60.1    +      -       -      +
    469D  SER*     3.4    24.8    +      -       -      +
----------------------------------------------------------
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Residues in contact with VAL 338 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    309D  MET*     3.5    22.9    -      -       +      -
    312D  TRP*     3.9    31.9    -      -       +      -
    334D  CYS*     3.0    32.6    +      -       -      +
    335D  TRP      3.3     7.6    -      -       -      +
    337D  GLU*     1.3    76.9    -      -       -      +
    339D  LEU*     1.3    62.3    +      -       +      +
    341D  MET*     3.5     6.3    +      -       -      +
    342D  GLY*     3.1    18.4    +      -       -      -
    401D  LYS*     4.3    22.7    -      -       +      +
    404D  ILE*     4.3    11.7    -      -       +      -
    405D  LEU      4.8     0.4    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 339 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    302D  ALA*     4.0    18.6    -      -       +      +
    305D  GLU*     3.7    39.8    -      -       +      +
    306D  LEU*     5.0     1.3    -      -       +      +
    309D  MET*     3.9    17.0    -      -       +      -
    335D  TRP*     2.9    39.6    +      -       +      +
    336D  MET*     3.0    14.8    +      -       -      +
    338D  VAL*     1.3    78.3    -      -       +      +
    340D  MET*     1.3    58.2    +      -       -      +
    342D  GLY*     3.0     4.8    +      -       -      -
    343D  LEU      2.8    22.2    +      -       -      -
    346D  ARG*     4.6     0.9    +      -       -      -
    501D  272      3.7    36.8    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 340 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    336D  MET*     2.8    30.7    +      -       +      +
    337D  GLU*     3.9     4.3    -      -       -      +
    339D  LEU*     1.3    69.2    -      -       -      +
    341D  MET*     1.3    65.3    +      -       -      +
    343D  LEU*     3.0     9.4    +      -       -      +
    344D  MET*     2.9    35.6    +      -       +      +
    376D  ILE*     4.3     2.9    -      -       +      -
    380D  LEU*     3.8    26.2    -      -       +      -
    465D  VAL*     4.5     4.0    -      -       +      +
    468D  ALA*     3.0    33.0    -      -       -      +
    469D  SER*     3.5    23.6    -      -       -      -
    472D  GLY*     4.1     3.6    -      -       -      -
    501D  272      3.5    43.1    -      -       -      +
----------------------------------------------------------
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Residues in contact with MET 341 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    337D  GLU      2.9    18.1    +      -       -      +
    338D  VAL*     3.7     6.1    -      -       -      +
    340D  MET*     1.3    75.6    -      -       -      +
    342D  GLY*     1.3    63.2    +      -       -      +
    344D  MET*     3.4     9.0    +      -       +      -
    345D  TRP*     3.1    22.0    +      -       -      +
    387D  PHE*     3.8    40.8    -      -       +      -
    392D  LEU*     3.8    25.1    -      -       +      -
    397D  TYR*     3.8    19.0    -      -       +      -
    400D  VAL*     4.2    20.0    -      -       +      -
    401D  LYS*     4.8     8.7    -      -       +      -
    404D  ILE*     3.9    20.2    -      -       +      -
    462D  LEU*     4.7     0.2    -      -       -      -
    465D  VAL*     4.4    12.9    -      -       +      +
----------------------------------------------------------
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Residues in contact with GLY 342 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    338D  VAL      3.1    11.3    +      -       -      -
    339D  LEU*     3.0     9.1    +      -       -      -
    341D  MET*     1.3    78.7    -      -       -      +
    343D  LEU*     1.3    60.6    +      -       -      +
    345D  TRP*     3.4     2.6    +      -       -      +
    346D  ARG*     3.2    41.0    +      -       -      +
    397D  TYR*     3.8    20.7    +      -       -      -
    401D  LYS*     5.4     1.8    -      -       -      +
----------------------------------------------------------
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Residues in contact with LEU 343 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    339D  LEU      2.8    12.8    +      -       -      +
    340D  MET*     3.0     9.6    +      -       -      +
    342D  GLY*     1.3    75.3    -      -       -      +
    344D  MET*     1.3    63.6    +      -       +      +
    346D  ARG*     3.3    14.1    +      -       -      +
    347D  SER*     2.9    41.7    +      -       -      +
    354D  LEU*     4.2    15.7    -      -       +      -
    355D  ILE      3.7    25.8    -      -       -      +
    356D  PHE*     3.8    20.6    -      -       +      +
    380D  LEU*     3.7    38.6    -      -       +      -
    501D  272      3.7    19.5    -      -       +      +
----------------------------------------------------------
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Residues in contact with MET 344 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    340D  MET*     2.9    26.8    +      -       +      +
    341D  MET*     3.8     8.1    -      -       +      +
    343D  LEU*     1.3    76.3    -      -       +      +
    345D  TRP*     1.3    67.1    +      -       -      +
    347D  SER*     2.9     2.9    +      -       -      -
    348D  ILE*     2.8    25.0    +      -       -      +
    380D  LEU*     3.7    29.6    -      -       +      +
    383D  THR*     3.7    39.5    -      -       +      +
    384D  THR*     3.2    32.3    -      -       -      +
    387D  PHE*     3.8    24.7    -      -       +      -
    465D  VAL*     4.2    17.9    -      -       +      -
    468D  ALA*     4.8     2.2    -      -       +      -
----------------------------------------------------------
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Residues in contact with TRP 345 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    341D  MET*     3.1     9.4    +      -       +      +
    342D  GLY      3.6     4.0    -      -       -      +
    344D  MET*     1.3    75.3    -      -       -      +
    346D  ARG*     1.3    70.0    +      -       +      +
    348D  ILE*     3.0    45.7    -      -       +      +
    392D  LEU*     3.5    40.4    -      -       +      -
    393D  GLN*     4.0     2.9    -      -       -      -
    394D  HIS*     3.3    56.7    +      +       +      -
    397D  TYR*     3.4    48.2    -      +       +      -
----------------------------------------------------------
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Residues in contact with ARG 346 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    279D  HIS*     5.1    18.4    -      -       +      +
    305D  GLU*     4.0    15.3    +      -       -      -
    339D  LEU      4.9     0.2    +      -       -      -
    342D  GLY*     3.2    30.6    +      -       -      +
    343D  LEU*     3.6    21.7    -      -       -      +
    344D  MET      3.2     0.2    -      -       -      -
    345D  TRP*     1.3    87.4    -      -       +      +
    347D  SER*     1.3    59.8    +      -       -      +
    348D  ILE*     3.4     0.8    +      -       -      +
    349D  ASP*     4.7     1.0    +      -       -      +
    350D  HIS*     3.8    11.3    +      -       -      -
    355D  ILE*     3.1    43.1    +      -       +      +
    356D  PHE*     3.2    25.8    +      -       -      +
    357D  ALA*     5.4     2.5    -      -       -      +
    358D  PRO*     5.8     2.9    -      -       -      -
    397D  TYR*     5.4     1.2    +      -       -      -
    501D  272      3.4    23.0    +      -       -      -
----------------------------------------------------------
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Residues in contact with SER 347 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    343D  LEU*     2.9    19.7    +      -       -      +
    344D  MET      2.9     5.8    +      -       -      -
    346D  ARG*     1.3    74.3    -      -       -      +
    348D  ILE*     1.3    66.9    +      -       -      +
    349D  ASP      3.2     2.9    -      -       -      -
    350D  HIS      2.9    15.7    +      -       -      -
    353D  LYS      3.5    16.6    -      -       -      -
    354D  LEU*     3.5     3.6    -      -       -      -
    355D  ILE*     2.7    33.7    +      -       -      -
    384D  THR*     3.9    15.9    -      -       -      -
    388D  ARG*     3.2    11.3    +      -       -      -
----------------------------------------------------------
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Residues in contact with ILE 348 (chain D). Click here for Legend to table.
----------------------------------------------------------
                                  Specific contacts
                               ---------------------------
     Residue       Dist    Surf   HB    Arom    Phob    DC
----------------------------------------------------------
    344D  MET      2.8    10.3    +      -       -      +
    345D  TRP*     3.0    39.7    -      -       +      +
    346D  ARG      3.4     0.6    -      -       -      -
    347D  SER*     1.3    77.2    -      -       -      +
    349D  ASP*     1.3    77.0    +      -       -      +
    384D  THR*     4.2     8.7    -      -       -      +
    387D  PHE*     3.8    16.6    -      -       +      +
    388D  ARG*     2.8    48.1    +      -       +      +
    391D  LYS*     4.8     1.6    -      -       -      -
    392D  LEU*     3.8    41.5    -      -       +      +
----------------------------------------------------------
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A short description of the analytical approach
The contact analysis used in this page is based upon the approach developed in: Sobolev V., Wade R.C., Vriend G. and Edelman M. PROTEINS (1996) 25, 120-129. Contact legitimacy depends on the hydrophobic-hydrophilic properties of the contacting atoms. In order to define it, for each inter-atomic contact, eight atom classes have been introduced:


   I  Hydrophilic      - N and O that can donate and accept hydrogen bonds
                         (e.g., oxygen of hydroxyl group of Ser. or Thr)
  II  Acceptor         - N or O that can only accept a hydrogen bond
 III  Donor            - N that can only donate a hydrogen bond
  IV  Hydrophobic      - Cl, Br, I and all C atoms that are not in
                         aromatic rings and do not have a covalent bond to
                         a N or O atom
   V  Aromatic         - C in aromatic rings irrespective of any other 
                         bonds formed by the atom
  VI  Neutral          - C atoms that have a covalent bond to at least one
                         atom of class I or two or more atoms from class II
                         or III; atoms; S, F, P, and metal atoms in all cases
 VII  Neutral-donor    - C atoms that have a covalent bond with only one
                         atom of class III
VIII  Neutral-acceptor - C atoms that have a covalent bond with only 
                         one atom of class II
For each pair of contacts the state of legitimacy is shown below:

Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
  Atomic class           I  II  III   IV   V   VI  VII  VIII
------------------------------------------------------------
   I  (Hydrophilic)      +   +    +    -   +   +    +    +
  II  (Acceptor)         +   -    +    -   +   +    +    -
 III  (Donor)            +   +    -    -   +   +    -    +
  IV  (Hydrophobic)      -   -    -    +   +   +    +    +
   V  (Aromatic)         +   +    +    +   +   +    +    +
  VI  (Neutral)          +   +    +    +   +   +    +    +
 VII  (Neutral-donor)    +   +    -    +   +   +    -    +
VIII  (Neutral-acceptor) +   -    +    +   +   +    +    -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically assigned based on the atomic coordinates. However, in three cases (see below) the automatic assignment is currently ambiguous. In these cases, the user is advised to manually analyse the full list of contacts using LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are 
   considered "aromatic" (Class V) if the ring is approximately
   planar, and "hydrophobic" (Class IV) or "neutral" (Classes
   VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
   "hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
   "carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).

Please E-mail any questions and/or suggestions concerning this page to Vladimir.Sobolev@weizmann.ac.il